2205B0JE-DA-J-N_2014.05.
5 Maintenance and Inspection
Screw Compressor J-series
5.4 Disassembly and Assembly of the Compressor
5-38
5.4.11.1 Common Precautions for Removal/Installation
Unloader cylinder cover assembly
Pull out /Install the unloader cylinder cover assembly horizontally.
The unloader indicator cam may be damaged if handled inappropriately.
Retaining
ring
The retaining ring may jump out, causing injuries. Always use retaining ring pliers
of appropriate size and wear protective goggles.
Unloader
piston
The 170JS, 170JM, 220JS, 220JM, 280JS, and 280JM have an unloader spacer
installed at the back of unloader piston. Therefore, remove the unloader spacer
form the unloader push rod after removing the unloader piston, when
disassembling the 170JS, 170JM, 220JS, 220JM, 280JS, and 280JM.
Therefore, install the unloader spacer to the unloader push rod before installing
the unloader piston, when assembling the 170JS, 170JM, 220JS, 220JM, 280JS,
and 280JM.
5.4.11.2 Precautions for Removal
Unloader cylinder cover assembly
The unloader indicator cam is assembled in the unloader cylinder cover assembly. The unloader
indicator cam is fitted on the internal surface of the unloader slide valve push rod and rotated by
the pin of the push rod as guide.
1.
Insert hexagon socket head cap screws (M10, for 170J) or eye bolts (M8, for 220J/280J) in the
service holes and tighten the screws evenly to expand the gap between the flange faces of
unloader cylinder and unloader cylinder cover.
2.
Hold the hexagon socket head cap screws (M10, for 170J) or eye bolts (M8, for 220J/280J), pull
out the unloader cylinder cover horizontally and remove.
